EP2899511A1 - Capteur insensible à la polarité - Google Patents

Capteur insensible à la polarité Download PDF

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Publication number
EP2899511A1
EP2899511A1 EP15152787.6A EP15152787A EP2899511A1 EP 2899511 A1 EP2899511 A1 EP 2899511A1 EP 15152787 A EP15152787 A EP 15152787A EP 2899511 A1 EP2899511 A1 EP 2899511A1
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EP
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Prior art keywords
given input
port
sensor
output
mosfets
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EP15152787.6A
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German (de)
English (en)
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EP2899511B1 (fr
EP2899511B8 (fr
Inventor
Rene Putinier
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Sensata Technologies Inc
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BEI Sensors and Systems Co LLC
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/07—Hall effect devices
    • G01R33/072—Constructional adaptation of the sensor to specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B2210/00—Aspects not specifically covered by any group under G01B, e.g. of wheel alignment, caliper-like sensors
    • G01B2210/58—Wireless transmission of information between a sensor or probe and a control or evaluation unit

Definitions

  • Potentiometers have a physical contact that rides on a resistive element.
  • the physical contact of the potentiometer is a point of failure for the potentiometer. This point of failure decreases the reliability of potentiometers in relation to non-contacting sensors, such as a Hall Effect sensor.
  • Non-contacting sensors, such as Hall Effect sensors, can replace potentiometers in many applications.
  • a linear or rotation sensor includes a first conversion sensor configured to produce a first output responsive to a given input.
  • the sensor further includes a second conversion sensor configured to produce a second output responsive to the given input.
  • the sum of the first output and second outputs is constant regardless of whether the given input has a positive or negative polarity.
  • the sensor also includes a semiconductor rectifier arranged to power the first conversion sensor and the second conversion sensor with a given polarity regardless of whether the given input has a positive or negative polarity.
  • the sensor also includes a semiconductor multiplexer circuit arranged to direct the first output to a common output port if the given input has a positive polarity and direct the second output to the common output port if the given input has a negative polarity.
  • the first conversion sensor is a hall effect sensor and the second conversion sensor is a hall effect sensor.
  • the semiconductor multiplexer can include a first channel to direct the first output to the common output port.
  • the first channel includes a first set of n-type MOSFET semiconductors connected in series and a second set of p-type MOSFET semiconductors connected in series. The first set and the second set are connected in parallel.
  • the semiconductor multiplexer includes a second channel to direct the second output to the common output port.
  • the second channel includes a third set of n-type MOSFET semiconductors connected in series and a fourth set of p-type MOSFET semiconductors connected in series. The third set and the fourth set are connected in parallel.
  • respective sources of the MOSFETs within the respective first, second, third, and fourth sets of semiconductors are directly connected.
  • the respective gates of the MOSFETs of the first, second, third, and fourth sets of semiconductors are directly connected.
  • a first of the drains of the first set and a first of the drains of the second set are coupled to receive the first output.
  • the gates of the first set and the fourth set are coupled to a first input port receiving a first signal defining a first portion of the given input.
  • the gates of the second set and the third set are coupled to a second input port receiving a second signal defining a second portion of the given input.
  • the first and second signals when measured relative to each other at the same time instants, determine the polarity of the given input signal.
  • a first of the drains of the third set and a first of the drains of the fourth set are coupled to receive the second output.
  • a second of the drains of the first set, a second of the drains of the second set, a second of the drains of the third set, and a second of the drains of the fourth set are coupled to the common output port.
  • the semiconductor rectifier includes at least four MOSFETs.
  • Each MOSFET has a respective source, drain, and gate.
  • a first of the MOSFETs is coupled (i) at its drain to a first port of the given input and a drain of a second of the MOSFETs, (ii) at its gate to a second port of the given input, and (iii) at its source to a the source of third of the MOSFETs and the first and second conversion sensors.
  • the second of the MOSFETs is coupled (i) at its drain to the first port of the given input and the drain of the first of the MOSFETs, (iii) at its gate to a second port of the given input, and (iii) at its source the source of to a fourth of the MOSFETs and the first and second conversion sensors.
  • the third of the MOSFETs is coupled (i) at its source to the source of the first of the MOSFETs, and the first and second conversion sensors, (ii) at its drain to the second port of the given input, and (iii) at its gate to the first port if the given input.
  • the fourth of the MOSFETs is coupled (i) at its drain to the second port of the given input and the drain of the third of the MOSFETs, (ii) at its gate to the first port of the given input, and (iii) at its source to the source of the second MOSFETs and the first and second conversion sensors.
  • the semiconductor rectifier is configured to direct a signal of a correct polarity to the first conversion sensor and the second conversion sensor based on the polarity of the given input.
  • the semiconductor multiplexer based on the polarity of the same given input, is configured to direct the first output or the second output to the common output port.
  • the sensor also includes a programming module including three ports through which to program the first and second conversion sensors.
  • the first and second programming module ports are coupled to the semiconductor rectifier to power the first and second conversion sensors during application of positive and negative polarity voltage levels, respectively.
  • the third programming module port is coupled to the common output to program the first and second conversion sensors during application of the positive and negative polarity voltage levels, respectively, to the first and second conversion sensors.
  • the first and second conversion sensors are configured to measure a rotation or linear position of a mechanical device being observed regardless of the polarity of the given input.
  • a method of sensing linear position or rotation includes producing a first output responsive to a given input at a first conversion sensor.
  • the method further includes producing a second output responsive to the given input at a second conversion sensor.
  • the sum of the first output and second outputs is constant regardless of whether the given input has positive or negative polarity.
  • the method further includes powering, at a semiconductor rectifier, the first conversion sensor and the second conversion sensor with a given polarity regardless of whether the given input has a positive or negative polarity.
  • the method also includes directing, at a semiconductor multiplexer circuit, the first output to a common output port if the given input has a positive polarity and the second output to the common output port if the given input has a negative polarity.
  • an apparatus for linear or rotation sensor includes a first conversion sensor means for producing a first output responsive to a given input.
  • the apparatus further includes a second conversion sensor means for producing a second output responsive to the given input.
  • the sum of the first output and second output is constant regardless of whether the given input has a positive or negative polarity.
  • the apparatus further includes a semiconductor rectifier means for powering the first conversion sensor and the second conversion with a given polarity regardless of whether the given input has a positive or negative polarity.
  • the apparatus also includes a semiconductor multiplexer means for directing the first output to a common output port if the given input has a positive polarity and direct the second output to the common output port if the given input has a negative polarity.
  • Fig. 1 is a block diagram 100 illustrating an example embodiment of a polarity insensitive Hall Effect sensor 110 employed by the present invention.
  • the polarity insensitive Hall Effect sensor 110 includes a first input port 106a and second input port 106b, which can be connected to a first supply port 104a and second supply port 104b of a supply device 102, or other input device.
  • the polarity insensitive hall effect sensor 110 is configured to receive input from the supply device 102 in any polarity. For example, when the first supply port 104a is coupled with the first input port 106a and the second supply port 104b is coupled with the second input port 106b, the supply device 102 provides a first polarity path 108a-b to the polarity insensitive Hall Effect sensor 110.
  • the supply device 102 provides a second polarity path 112a-b to the polarity insensitive Hall Effect Sensor 110. Reversing the connections of the input ports 106a-b to the supply ports 104a-b reverses the polarity of the polarity paths 108a-b and 112a-b. For example, if the first polarity path 108a-b provides a voltage difference of 5V, reversing the connections reverses the polarity in the second polarity path 112a-b, making it negative 5V.
  • the polarity insensitive Hall Effect sensor 110 outputs, at its output port 114. Like a traditional potentiometer, reversing the polarity of the input can reverse the output. For example, a potentiometer which has an output range of 0-5V and outputs 4V for the position of its rotor for one polarity outputs 1V for the same position of the rotor for a reverse polarity. The polarity insensitive Hall Effect sensor 110 performs the same way.
  • Fig. 2 is a block diagram 200 illustrating an example embodiment of a traditional potentiometer 208.
  • the potentiometer is connected to a first input port 202 (POWER1) and a second input port 204 (POWER2).
  • the potentiometer 208 also has an output port 206.
  • the potentiometer 208 based on a position of a rotor, outputs a voltage proportional to the position of the rotor between the voltage difference of the first input port 202 and second input port 204.
  • Some applications use potentiometers 208 as a ratiometric device (e.g., a device that produces an output proportional to its input).
  • Inputs of power are applied to the potentiometer 208 element.
  • the potentiometer 208 element outputs a voltage on a wiper output (e.g., the output port 206) that varies between power (e.g., first input port 202) and ground (e.g., second input port 204) as the rotor is turned.
  • power and ground can be applied to either end of the device because the potentiometer is a resistor, such that the first input port 202 can be either a power or a ground and the second input port 204 can be either a power of a ground.
  • Fig. 3 is a block diagram 300 of an embodiment of a Hall Effect sensor 308 employed to emulate a potentiometer. Unlike the resistance based potentiometer of Fig. 2 , a Hall Effect sensor 308 of Fig. 3 is an active semiconductor device and needs to have power and ground applied to specific ports. In the embodiment shown in Fig. 3 , the Hall Effect sensor 308 has the first input port 302 (POWER1), which is the power supply, connected to port 1 (V dd ) and has the second input port 304 (POWER2), which is the ground, connected to port 8 (V ss ).
  • POWER1 the first input port 302
  • V dd the power supply
  • the Hall Effect sensor 308 cannot swap the power and ground (e.g., applying power to port 8 (V ss ) and applying ground to port 1 (V dd )), however, such a swap can be performed on a traditional resistor based potentiometer, such as the potentiometer 208 of Fig. 3 .
  • Fig. 4 is a high level block diagram 400 illustrating an example embodiment of the present invention.
  • the present invention is a polarity insensitive Hall Effect sensor which includes additional circuitry that allows power and ground to be applied in any polarity.
  • it also changes the output voltage to mimic the output of a potentiometer. For example, suppose a user applied a 5V difference to a potentiometer which, based on the position of the rotor, output 4V. If the user then reversed the power and ground inputs to the potentiometer, the potentiometer would then output 1V (e.g., the inverse of the output with the reverse polarity based on the power scale, or 5V- 4V ) .
  • 1V e.g., the inverse of the output with the reverse polarity based on the power scale, or 5V- 4V
  • the polarity insensitive Hall Effect sensor modifies the output voltage to match this behavior.
  • the present invention further provides protection for the Hall Effect Sensor against reverse polarity. Hall Effect sensors can be damaged by applying negative voltage to the power pins.
  • the present invention provides current paths that prevent the Hall Effect sensor itself from receiving a negative voltage.
  • a semiconductor rectifier 410 is coupled to a first input port 402 and a second input port 404, receiving voltages of V 1 and V 2 , respectively.
  • the semiconductor rectifier 410 is coupled to output to a first conversion sensor 412 and second conversion sensor 414, which can both be Hall Effect sensors, or other polarity sensitive sensors.
  • the semiconductor rectifier 410 is configured to output a positive polarity to both the first conversion sensor 412 and second conversion sensor 414, regardless of the polarity of the first input port 402 and second input port 404. In other words, the semiconductor rectifier provides a voltage difference of
  • the first conversion sensor 412 and second conversion sensor 414 can output respective working signals, being Out 1 and Out 2 , respectively, to a semiconductor multiplexer circuit 416.
  • the semiconductor multiplexer circuit 416 is configured to determine the polarity of the first input port 402 and second input port 404 (e.g.,
  • the polarity insensitive Hall Effect sensor can receive a positive or negative power on either its first input port 402 or second input port 404.
  • An individual Hall Effect sensor such as the Hall Effect sensor 308 shown in Fig. 3 , can only receive positive power on its POWER1 lead and V dd port and negative power (or ground) on its POWER2 lead and V ss port.
  • the Hall Effect Sensor 308 sensor does not operate.
  • the voltage is more than a particular amount, such as 10V, certain Hall Effect sensors can be damaged.
  • the polarity insensitive Hall Effect sensor employed in an embodiment of the present invention solves this problem by conditioning the input signals and output signals.
  • the polarity insensitive Hall Effect sensor like a traditional potentiometer, has two input power leads and a single output lead to the outside world.
  • Fig. 5 is a block diagram 500 illustrating an example embodiment of the polarity insensitive Hall Effect sensor employed in an embodiment of the present invention.
  • the polarity insensitive Hall Effect sensor employs a semiconductor rectifier 510, first conversion sensor 512, second conversion sensor 514, and semiconductor multiplexer circuit 516, corresponding to the semiconductor rectifier 410, first conversion sensor 412, second conversion sensor 414, and semiconductor multiplexer circuit 416 of Fig. 4 .
  • the polarity insensitive Hall Effect sensor receives input from a first input port 502 (POWER1), second input port 504 (POWER2), corresponding to the first input port 402 and second input port 404, respectively, of Fig. 4 .
  • the polarity insensitive Hall Effect sensor outputs at an output port 506, corresponding to the output port 406 of Fig. 4 .
  • MOSFET transistor elements Q1-Q12 are shown. Each MOSFET transistor has a respective source, drain, and gate, which are indicated in Fig. 5 by the designations "S" for source, “D” for drain, and “G” for gate, respectively.
  • the configuration of Fig. 5 shows an example embodiment of the semiconductor rectifier 510 and semiconductor multiplexer circuit 516 coupled with the first and second conversion sensors 512 and 514, but other arrangements of semiconductor elements such as the MOSFET transistor elements can be employed.
  • An example MOSFET that can be used is the International Rectifier IRF7343 HEXFET® Power MOSFET, the details of which are available at the manufacturer's website, in particular at http://www.irf.com/product-info/datasheets/data/irf7343.pdf.
  • the IRF7343 houses one p-channel MOSFET and one n-channel MOSFET, however, other MOSFETs can be used.
  • MOSFET transistor elements Q1, Q2, Q3 and Q4 rectify the POWER1 and POWER2 signals.
  • Q1 and Q3 are N-channel MOSFETs and Q2 and Q4 are P-channel MOSFETs.
  • the semiconductor rectifier 510 is coupled to provide a correct polarity to the first conversion sensor 512 and second conversion sensor 514 at their V dd1 and V ss1 and V dd2 and V ss2 ports, respectively.
  • a capacitor C1 maintains a voltage difference between the two outputs of the semiconductor rectifier 510.
  • Capacitors C2 and C3 further maintain a voltage difference between one of the outputs of the semiconductor rectifiers and the first conversion sensor 512 and second conversion sensor 514.
  • the first conversion sensor 512 provides an output to the semiconductor multiplexer circuit 516 and the second conversion sensor 514 provides an output to the semiconductor multiplexer circuit 516.
  • the semiconductor multiplexer circuit 516 also accepts POWER1 and POWER2 as inputs. Based on the relationship of POWER1 and POWER2, the semiconductor multiplexer circuit 516 outputs either the output of the first conversion sensor 512 or the output of the second multiplexer circuit 516 at the output port 506.
  • Fig. 6A is a block diagram 600 illustrating an example embodiment of current paths in the polarity insensitive Hall Effect sensor in a first polarity. If the voltage of POWER1 is greater than POWER2 (POWER1 > POWER2), Q2 and Q3 turn on and conduct, and Q1 and Q4 turn off and do not conduct.
  • POWER1 Current Path 610a-b therefore conducts through Q2 to V dd1 of the first conversion sensor 512.
  • the POWER1 current path 610b continues at V ss1 of the first conversion sensor 512, conducting through Q3 to the second input port 604.
  • the POWER1 current path 610a also conducts to V dd2 of the second conversion sensor 514.
  • the POWER1 current path 610b also continues at V ss2 of the second conversion sensor 514, conducting through Q3 to the second input port 604.
  • Fig. 6B is a block diagram 620 illustrating an example embodiment of current paths in the polarity insensitive Hall Effect sensor in a second polarity.
  • POWER2 is greater than POWER1 (POWER1 ⁇ POWER2), Q1 and Q4 turn on and conduct and Q2 and Q3 turn off and do not conduct.
  • the POWER2 current path 630b therefore conducts from POWER2 through Q4 to V dd2 of the second conversion sensor 514.
  • the POWER2 current path 630b also continues at V ss2 of the second conversion sensor 514, conducting through Q1 to the first input port 602.
  • the POWER2 current path 630a also conducts to V dd1 of the first conversion sensor 512.
  • the POWER2 current path 630b also continues at V ss1 of the first conversion sensor 512, conducting through Q1 to the first input port 602.
  • Q1, Q2, Q3, and Q4 are selected so that the sum of gate threshold voltages of the N and P channel MOSFETs is less than the applied voltage.
  • the Q1, Q2, Q3, and Q4 MOSFETs of the semiconductor rectifier 510 route the positive voltage applied to the V dd1 and V dd2 pins of the first conversion sensor 512 and second conversion sensor 514 (e.g., Hall Effect sensors), respectively.
  • the Q1, Q2, Q3, and Q4 MOSFETs of the semiconductor rectifier 510 route the negative voltage to the V ss1 and V ss2 pins of the first conversion sensor 512 and second conversion sensor 514, respectively.
  • the first conversion sensor 512 outputs a signal at Out1 (Port 15) as Power1 Output Path 612 and the second conversion sensor 514 outputs a signal at Out2 (port 7) as Power2 Output Path 632.
  • the semiconductor multiplexer circuit 516 (e.g., a switch matrix) routes one of the two outputs, Out1 and Out2 of the first conversion sensor 512 and second conversion sensor 514, respectively, to the output port 606.
  • the semiconductor multiplexer circuit 516 is comprised of MOSFETs Q5, Q6, Q7, Q8, Q9, Q10, Q11 and Q12.
  • the MOSFETs Q5-Q12 are MOSFET pair IRF7343 devices, however other MOSFETs can be used.
  • Figs. 6A-B show the current paths powering the respective conversion sensor that is outputting to the output port 606 to clearly show the role of the semiconductor rectifier and semiconductor multiplexer, even though both conversion sensors are simultaneously powered.
  • Pairs of MOSFETs Q5 and Q6, Q7 and Q8, (the first channel) Q9 and Q10, and Q11 and Q12 (the second channel) are coupled at each pair's respective MOSFET source port such that the body diode of the opposing channel MOSFET does not conduct current.
  • each channel needs a set of N-channel MOSFETs and a set of P-channel MOSFETs because neither an N- channel MOSFET nor a P-channel MOSFET alone can conduct over the full range of output voltages for the polarity insensitive Hall Effect sensor.
  • POWER1 when POWER1 is positive (e.g., 5V) relative to POWER2, the gates of Q5 and Q6 are at 5V, and Q5 and Q6 are turned on for output voltages from 0 to about 4V. Above 4V, there is no longer sufficient gate-source voltage to keep the MOSFET on.
  • P-channel MOSFETs Q7 and Q8 are turned on when the output voltage is between 1V and 5V, but for voltages below 1V, there is insufficient gate-source voltage to keep them on. For much of the range, both the N- channel and P-channel MOSFETs pairs are active but at the extremes of the range, only one or the other is turned on.
  • the combined output at the Output Port 606 is the combination of the current through MOSFET pairs Q5 and Q6 and Q7 and Q8.
  • the output impedance varies, typical current draw in most applications is small, so the voltage drop in the semiconductor multiplex has a minimal variance in the voltage drop.
  • the resistance at saturation (Rds) of the MOSFETS determines the voltage drop through the MOSFETs.
  • MOSFET One example MOSFET that can be used is the IRF7343, which has 50m ⁇ and 105m ⁇ Rds for the N- and P-channel MOSFETs, respectively.
  • These Hall Effect sensors consume current of approximately 16 milliamps (mA), which causes a voltage drop through the MOSFETS of about 2.48mV.
  • the voltage applied powers two Hall Effect sensors, for example an MLX90316, which houses two separate Hall Effect sensor dies in one package.
  • Fig. 7 is a graph 700 illustrating an example embodiment of percentage output of the polarity insensitive Hall Effect sensor as a function of a rotary position of a rotor in degrees.
  • the polarity insensitive Hall Effect sensor has two output curves, Output1 702 and Output2 704, representing a respective polarity of the input signal.
  • Output1 702 and Output2 704 representing a respective polarity of the input signal.
  • the output polarity of the Hall Effect sensor is inversed to mimic the output of a traditional potentiometer.
  • the wiper of a potentiometer is offset from center and the polarity of the input voltage is reversed, the output voltage follows the input.
  • the semiconductor multiplexer circuit, or output multiplexer switches from the output of one Hall Effect sensor to the other Hall Effect Sensor.
  • Potentiometers and their Hall Effect sensor equivalents can change their output linearly as the rotational position they are detecting changes.
  • Output1 702 shows the output of the polarity insensitive Hall Effect sensor in a first polarity.
  • Output 2 704, the complimentary output to Output1 702 should therefore an increase in voltage from the negative supply that is the same as the voltage decrease that Output 1 702 has from the positive supply. For example, if the input shaft of the hall sensor is at 90°, Output1 702 produces a signal representing 25% of the positive supply, and Output2 704 produces a signal representing 75% of the positive supply, or 25% away from the negative supply.
  • the invention also solves a problem created when using the two Hall Effect sensors.
  • Each Hall Effect sensor is programmed, for example by a Melexis PTC-04 programming box. Programming a Hall Effect sensor is performed by connecting to three wires of the sensor. However, two Hall Effect sensors share the three wires.
  • the circuit of the present invention solves this problem. To program the first hall sensor, the three programming wires are connected to the polarity insensitive Hall Effect Sensor. To program the second sensor, the power and ground wires are reversed and a second sensor can then be programmed.
  • the programing box can access only one of the two sensors at a time because the switching elements behave different depending on how power is applied.
  • the polarity insensitive Hall Effect sensor allows power reversal and therefore provides a way of programming two Hall sensors through a single wire interface.
  • V out V supply - V in when polarity is reversed.
  • Using only one Hall Effect sensor reduces cost and requires programming of only one Hall Effect sensor.
  • the output when the polarity is reversed may have a larger error because the amplifier's error is added to the Hall Effect error.
  • only one sensor is active at a time so only the error from one sensor is present.
  • MOSFET transistors e.g., relays or other devices
  • Other elements could be used as substitutes for the MOSFET transistors (e.g., relays or other devices) as long as they have high off state resistance and low voltage drop in the on state.
  • Example 1 comprises a linear or rotation sensor, comprising a first conversion sensor configured to produce a first output responsive to a given input, a second conversion sensor configured to produce a second output responsive to the given input, the sum of the first output and second outputs being constant regardless of whether the given input has a positive or negative polarity, a semiconductor rectifier arranged to power the first conversion sensor and the second conversion sensor with a given polarity regardless of whether the given input has a positive or negative polarity, and a semiconductor multiplexer circuit arranged to direct the first output to a common output port if the given input has a positive polarity and direct the second output to the common output port if the given input has a negative polarity.
  • Example 2 comprises the sensor of Example 1, wherein the first conversion sensor is a hall effect sensor and the second conversion sensor is a hall effect sensor.
  • Example 3 comprises the sensor of any one of Examples 1 and 2, wherein the semiconductor multiplexer includes a first channel to direct the first output to the common output port, the first channel including a first set of n-type MOSFET semiconductors connected in series and a second set of p-type MOSFET semiconductors connected in series, the first set and the second set connected in parallel, and a second channel to direct the second output to the common output port, the second channel including a third set of n-type MOSFET semiconductors connected in series and a fourth set of p-type MOSFET semiconductors connected in series, the third set and the fourth set connected in parallel.
  • the semiconductor multiplexer includes a first channel to direct the first output to the common output port, the first channel including a first set of n-type MOSFET semiconductors connected in series and a second set of p-type MOSFET semiconductors connected in series, the first set and the second set connected in parallel, and a second channel to direct the second output to the common output port, the second channel including a third set of
  • Example 4 comprises the sensor of Example 3, wherein respective sources of the MOSFETs within the respective first, second, third, and fourth sets of semiconductors are directly connected, the respective gates of the MOSFETs of the first, second, third, and fourth sets of semiconductors are directly connected, a first of the drains of the first set and a first of the drains of the second set are coupled to receive the first output, the gates of the first set and the fourth set are coupled to a first input port receiving a first signal defining a first portion of the given input, the gates of the second set and the third set are coupled to a second input port receiving a second signal defining a second portion of the given input, the first and second signals, when measured relative to each other at the same time instants determining the polarity of the given input signal, a first of the drains of the third set and a first of the drains of the fourth set are coupled to receive the second output, and a second of the drains of the first set, a second of the drains of the second set, a second of the
  • Example 5 comprises the sensor of any one of Examples 1 to 4, wherein the semiconductor rectifier includes at least four MOSTFETs, each MOSFET having a respective source, drain, and gate, a first of the MOSFETs is coupled (i) at its drain to a first port of the given input and a drain of a second of the MOSFETs, (ii) at its gate to a second port of the given input, and (iii) at its source to the source of a third of the MOSFETs and the first and second conversion sensors, the second of the MOSFETs is coupled (i) at its drain to the first port of the given input and the drain of the first of the MOSFETs, (iii) at its gate to a second port of the given input, and (iii) at its source to the source of a fourth of the MOSFETs and the first and second conversion sensors, the third of the MOSFETs is coupled (i) at its source to the source of the first MOSFETs, and the first and second conversion sensors, (i
  • Example 6 comprises the sensor of any one of Examples 1 to 5, wherein the semiconductor rectifier is configured to direct a signal of a correct polarity to the first conversion sensor and the second conversion sensor based on the polarity of the given input, and the semiconductor multiplexer, based on the polarity of the same given input, is configured to direct the first output or the second output to the common output port.
  • Example 7 comprises the sensor of any one of Examples 1 to 6, further comprising a programming module including three ports through which to program the first and second conversion sensors, wherein first and second programming module ports are coupled to the semiconductor rectifier to power the first and second conversion sensors during application of positive and negative polarity voltage levels, respectively, and wherein the third programming module port is coupled to the common output to program the first and second conversion sensors during application of the positive and negative polarity voltage levels, respectively, to the first and second conversion sensors.
  • a programming module including three ports through which to program the first and second conversion sensors, wherein first and second programming module ports are coupled to the semiconductor rectifier to power the first and second conversion sensors during application of positive and negative polarity voltage levels, respectively, and wherein the third programming module port is coupled to the common output to program the first and second conversion sensors during application of the positive and negative polarity voltage levels, respectively, to the first and second conversion sensors.
  • Example 8 comprises the sensor of any one of Examples 1 to 7, wherein the first and second conversion sensors are configured to measure a rotation or linear position of a mechanical device being observed regardless of the polarity of the given input.
  • Example 9 comprises a method of sensing linear position or rotation, the method comprising producing a first output responsive to a given input at a first conversion sensor, producing a second output responsive to the given input at a second conversion sensor, the sum of the first output and second outputs being constant regardless of whether the given input has positive or negative polarity, powering, at a semiconductor rectifier, the first conversion sensor and the second conversion sensor with a given polarity regardless of whether the given input has a positive or negative polarity, directing, at a semiconductor multiplexer circuit, the first output to a common output port if the given input has a positive polarity and the second output to the common output port if the given input has a negative polarity.
  • Example 10 comprises the method of Example 9, wherein the first conversion sensor is a hall effect sensor and the second conversion sensor is a hall effect sensor.
  • Example 11 comprises the method of any one of Examples 9 and 10, further comprising directing, in a first channel of the semiconductor multiplexer, the first output to the common output port, the first channel including a first set of n-type MOSFET semiconductors connected in series and a second set of p-type MOSFET semiconductors connected in series, the first set and the second set connected in parallel, and directing, in a second channel of the semiconductor multiplexer, the second output to the common output port, the second channel including a third set of n-type MOSFET semiconductors connected in series and a fourth set of p-type MOSFET semiconductors connected in series, the third set and the fourth set connected in parallel.
  • Example 12 comprises the method of Example 11, further comprising directly connecting respective sources of the MOSFETs within the respective first, second, third, and fourth sets of semiconductors, directly connecting the gates of MOSFETs within the respective first, second, third, and fourth sets of semiconductors, coupling a first of the drains of the first set and a first of the drains of the second set to receive the first output, coupling the gates of the first set and the fourth set to a first input port receiving a first signal defining a first portion of the given input, coupling the gates of the second set and the third set to a second input port receiving a second signal defining a second portion of the given input, the first and second signals, when measured relative to each other at the same time instants determine the polarity of the given input signal, coupling a first of the drains of the third set and a first of the drains of the fourth set to receive the second output, and coupling a second of the drains of the first set, a second of the drains of the second set, a second of the drain
  • Example 13 comprises the method of any one of Examples 9 to 12, wherein the semiconductor rectifier includes at least four MOSFETs, each MOSFET having a respective source, drain, and gate, and further comprising coupling a first of the MOSFETs (i) at its drain to a first port of the given input and a drain of a second of the MOSFETs, (ii) at its gate a second port of the given input, and (iii) at its source to the source of a third of the MOSFETs and the first and second conversion sensors, coupling the second of the MOSFETs (i) at its drain to the first port of the given input and the drain of the first of the MOSFETs, (ii) at its gate to a second port of the given input, and (ii) at its source to the source of a fourth of the MOSFETs and the first and second conversion sensors, coupling the third of the MOSFETs (i) at its source to the source of the first of the MOSFETs, and the first and second conversion sensors,
  • Example 14 comprises the method of any one of Examples 9 to 13, further comprising directing, at the semiconductor rectifier, a signal of a correct polarity to the first conversion sensor and the second conversion sensor based the polarity of the given input, and directing, the semiconductor multiplexer, based on the polarity of the given input, first output or the second output to the common output port.
  • Example 15 comprises the method of any one of Examples 9 to 14, further comprising programming the first and second conversion sensors using a programming module having three ports through which to program the first and second conversion sensors by: coupling first and second programming module ports to the semiconductor rectifier to power the first and second conversion sensors during application of positive and negative polarity voltage levels, respectively, and coupling the third programming module port to the common output to program the first and second conversion sensors during application of the positive and negative polarity voltage levels, respectively, to the first and second conversion sensors.
  • Example 16 comprises the method of any one of Examples 9 to 15, further comprising measuring, at the first and second conversion sensors, a rotation or linear position of a mechanical device being observed regardless of the polarity of the given input.
  • Example 17 comprises an apparatus for a linear or rotation sensor, comprising means for producing a first output responsive to a given input ,means for producing a second output responsive to the given input, the sum of the first output and second output being constant regardless of whether the given input has a positive or negative polarity, means for powering the first conversion sensor and the second conversion with a given polarity regardless of whether the given input has a positive or negative polarity, and means for directing the first output to a common output port if the given input has a positive polarity and direct the second output to the common output port if the given input has a negative polarity.
  • Example 18 comprises the apparatus of Example 17, wherein the first conversion sensor is a hall effect sensor and the second conversion sensor is a hall effect sensor.
  • Example 19 comprises the apparatus of any one of Examples 17 and 18, wherein the semiconductor multiplexer means further include means for directing the first output to the common output port, the first channel including a first set of n-type MOSFET semiconductors connected in series and a second set of p-type MOSFET semiconductors connected in series, the first set and the second set connected in parallel, and means for directing the second output to the common output port, the second channel including a third set of n-type MOSFET semiconductors connected in series and a fourth set of p-type MOSFET semiconductors connected in series, the third set and the fourth set connected in parallel.
  • the semiconductor multiplexer means further include means for directing the first output to the common output port, the first channel including a first set of n-type MOSFET semiconductors connected in series and a second set of p-type MOSFET semiconductors connected in series, the first set and the second set connected in parallel, and means for directing the second output to the common output port, the second channel including a third set of n-type MO
  • Example 20 comprises the apparatus of Example 19, wherein respective sources of the MOSFETs within the respective first, second, third, and fourth sets of semiconductors are directly connected, the gates of MOSFETS within the respective the first, second, third, and fourth sets of semiconductors are directly connected, a first of the drains of the first set and a first of the drains of the second set are coupled to receive the first output, the gates of the first set and the fourth set are coupled to a first input port receiving a first signal defining a first portion of the given input, the gates of the second set and the third set are coupled to a second input port receiving a second signal defining a second portion of the given input, the first and second signals, when measured relative to each other at the same time instants determine the polarity of the given input signal, a first of the drains of the third set and a first of the drains of the fourth set are coupled to receive the second output, and a second of the drains of the first set, a second of the drains of the second set, a second of the drain

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Measuring Magnetic Variables (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
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US11761985B2 (en) 2021-02-09 2023-09-19 Analog Devices International Unlimited Company Calibration using flipped sensor for highly dynamic system

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JPH02148955A (ja) 1988-11-29 1990-06-07 Nec Corp 極性検出回路
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US20020060889A1 (en) * 2000-11-21 2002-05-23 Teutsch Alexander Noam IC PMOS Schottky reverse bias protection structure
US7126801B2 (en) 2001-12-17 2006-10-24 Tellabs Oy Polarity protection implemented with a MOSFET
US20040052022A1 (en) 2002-09-13 2004-03-18 Laraia J. Marcos Integrated overvoltage and reverse voltage protection circuit
US7453268B2 (en) 2005-06-29 2008-11-18 Delphi Technologies, Inc. Input power protected ratiometric output sensor circuit
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US20150212165A1 (en) 2015-07-30
CN104807483A (zh) 2015-07-29
EP2899511B1 (fr) 2016-12-21
EP2899511B8 (fr) 2017-08-30

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